Plankton Generate a Cloudy Shield over the Antarctic 
After sunlight completes its eight-minute journey to Earth, white surfaces such as clouds send much of it bouncing right back into space. The whiter and brighter the cloud, the better it is at reflecting sunlight—and at keeping Earth cool. Now, a study published in Atmospheric Chemistry and Physics examines a surprising part of this process: how tiny aquatic creatures known as phytoplankton play a big role in whitening Earth's clouds.Scientists used satellites to monitor the skies above a large swath of the Southern Ocean for five years. They found that clouds forming south of 60 degrees latitude—that is, closer to Antarctica—tended to be significantly whiter than clouds farther north.
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